422 citations · 1.6k across the 14 of their papers we have counts for
14 papers
The germanium quantum information route
Giordano Scappucci, Christoph Kloeffel, Floris A. Zwanenburg +6
In the worldwide endeavor for disruptive quantum technologies, germanium is emerging as a versatile material to realize devices capable of encoding, processing, or transmitting qua…
Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
Bence Hetényi, Christoph Kloeffel, Daniel Loss
We study the exchange interaction between two hole-spin qubits in a double quantum dot setup in a silicon nanowire in the presence of magnetic and electric fields. Based on symmetr…
Self-controlled growth of highly uniform Ge/Si hut wires for scalable qubit devices
Fei Gao, Jian-Huan Wang, Hannes Watzinger +13
Semiconductor nanowires have been playing a crucial role in the development of nanoscale devices for the realization of spin qubits, Majorana fermions, single photon emitters, nano…
Low-symmetry nanowire cross-sections for enhanced Dresselhaus spin-orbit interaction
Miguel J. Carballido, Christoph Kloeffel, Dominik M. Zumbühl +1
We study theoretically the spin-orbit interaction of low-energy electrons in semiconducting nanowires with a zinc-blende lattice. The effective Dresselhaus term is derived for vari…
Direct Rashba spin-orbit interaction in Si and Ge nanowires with different growth directions
Christoph Kloeffel, Marko J. Rančić, Daniel Loss
We study theoretically the low-energy hole states in Si, Ge, and Ge/Si core/shell nanowires (NWs). The NW core in our model has a rectangular cross section, the results for a squar…
Heavy hole states in Germanium hut wires
Hannes Watzinger, Christoph Kloeffel, Lada Vukušić +11
Hole spins have gained considerable interest in the past few years due to their potential for fast electrically controlled qubits. Here, we study holes confined in Ge hut wires, a…
Long-Range Interaction between Charge and Spin Qubits in Quantum Dots
Marcel Serina, Christoph Kloeffel, Daniel Loss
We analyze and give estimates for the long-distance coupling via floating metallic gates between different types of spin qubits in quantum dots made of different commonly used mate…
Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots
Viktoriia Kornich, Christoph Kloeffel, Daniel Loss
We study theoretically the phonon-induced relaxation and decoherence of spin states of two electrons in a lateral double quantum dot in a SiGe/Si/SiGe heterostructure. We consider…
Acoustic phonons and strain in core/shell nanowires
Christoph Kloeffel, Mircea Trif, Daniel Loss
We study theoretically the low-energy phonons and the static strain in cylindrical core/shell nanowires (NWs). Assuming pseudomorphic growth, isotropic media, and a force-free wire…
Phonon-Mediated Decay of Singlet-Triplet Qubits in Double Quantum Dots
Viktoriia Kornich, Christoph Kloeffel, Daniel Loss
We study theoretically the phonon-induced relaxation () and decoherence times () of singlet-triplet qubits in lateral GaAs double quantum dots (DQDs). When the DQD is bia…
Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots
Christoph Kloeffel, Mircea Trif, Peter Stano +1
We propose a setup for universal and electrically controlled quantum information processing with hole spins in Ge/Si core/shell nanowire quantum dots (NW QDs). Single-qubit gates c…
Tunable g factor and phonon-mediated hole spin relaxation in Ge/Si nanowire quantum dots
Franziska Maier, Christoph Kloeffel, Daniel Loss
We theoretically consider g factor and spin lifetimes of holes in a longitudinal Ge/Si core/shell nanowire quantum dot that is exposed to external magnetic and electric fields. For…
Prospects for Spin-Based Quantum Computing
Christoph Kloeffel, Daniel Loss
Experimental and theoretical progress toward quantum computation with spins in quantum dots (QDs) is reviewed, with particular focus on QDs formed in GaAs heterostructures, on nano…
Strong Spin-Orbit Interaction and Helical Hole States in Ge/Si Nanowires
Christoph Kloeffel, Mircea Trif, Daniel Loss
We study theoretically the low-energy hole states of Ge/Si core/shell nanowires. The low-energy valence band is quasidegenerate, formed by two doublets of different orbital angular…